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Enhancement of the Diversity of Pollinators and Beneficial Insects in Intensively Managed Vineyards

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Enhancement of the Diversity of Pollinators and Beneficial Insects in Intensively Managed Vineyards insects Article Enhancement of the Diversity of Pollinators and Beneficial Insects in Intensively Managed Vineyards Francisco Javier Peris-Felipo 1,* , Fernando Santa 1 , Oscar Aguado 2, José Vicente Falcó-Garí 3, Alicia Iborra 3, Michael Schade 1, Claire Brittain 4, Vasileios Vasileiadis 1 and Luis Miranda-Barroso 5 1 Syngenta Crop Protection, Rosentalstrasse 67, 4058 Basel, Switzerland; [email protected] (F.S.); [email protected] (M.S.); [email protected] (V.V.) 2 Andrena Iniciativas y Estudios Medioambientales S.L., Calle Gabilondo 16bis, 47007 Valladolid, Spain; [email protected] 3 Laboratory of Entomology and Pest Control, Institute Cavanilles of Biodiversity and Evolutionary Biology, Calle Catedrático José Beltrán 2, Paterna, 46980 Valencia, Spain; [email protected] (J.V.F.-G.); [email protected] (A.I.) 4 Jeallot’s Hill International Research Centre, Syngenta, Bracknell RG42 6EY, UK; [email protected] 5 Agricultura Sostenible Syngenta España, Calle de la Ribera del Loira, 8, 10, 28042 Madrid, Spain; [email protected] * Correspondence: [email protected]; Tel.: +41-766-908-032 Simple Summary: The continuous intensification of agricultural production has resulted in higher yields and more yield security. However, these achievements went along with the substitution of heterogeneous agricultural landscapes by homogeneous ones with poor crop diversity, short crop Citation: Peris-Felipo, F.J.; Santa, F.; rotations, and thanks to the high efficacy of modern herbicides and also to minimum in-crop diversity. Aguado, O.; Falcó-Garí, J.V.; Iborra, A.; Schade, M.; Brittain, C.; A severe increase in plot size led to the elimination of ecologically valuable structural elements that Vasileiadis, V.; Miranda-Barroso, L. had provided floral resources and nesting sites. Over the few last decades, several studies have been Enhancement of the Diversity of conducted to try to find solutions against insect decline and to preserve biodiversity. In the present Pollinators and Beneficial Insects in study, the integration of cover plants between the lines of the vineyards to enhance biodiversity Intensively Managed Vineyards. is shown. The benefits of the cover plants use are presented based on the results achieved on five Insects 2021, 12, 740. intensive wine farms in Spain. Our findings suggest that the use of cover plants provide a wide range https://doi.org/10.3390/insects12080740 of enhancements in the insect community with a significant increase both in the number of species and the number of individuals showing an important influence over time, which would tend to have Academic Editors: Giovanni Burgio, a significant conservation impact thanks to its effect as a reservoir of species. David G. James, Daniele Sommaggio and Andrea Lucchi Abstract: (1) Modern, intensive agricultural practices have been attributed to the loss of insect biodiversity and abundance in agroecosystems for the last 80 years. The aim of this work is to test Received: 29 May 2021 Accepted: 16 August 2021 whether there are statistically significant differences in insect abundance between different zones Published: 18 August 2021 and over time on the vineyard field. (2) The study was carried out in five intensive wine farms in Spain over a three-year period (2013–2015). Each field was divided into two zones, one where Publisher’s Note: MDPI stays neutral cover plants were planted, and another remained unchanged (without cover). (3) A clear trend to with regard to jurisdictional claims in increase the average number of insect species and individuals throughout the years in all farms was published maps and institutional affil- observed. Moreover, the zones with cover plants showed a significant difference with respect to the iations. zones without. (4) The use of permanent cover plants allows creating areas of refuge for the insects favouring their conservation and reducing the agriculture impact in the insect decline. Keywords: biodiversity; vineyards; agro-ecosystems; sustainability; habitat management; insect Copyright: © 2021 by the authors. conservation; cover plants; natural enemies; pollinators Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons 1. Introduction Attribution (CC BY) license (https:// Since World War II, governments have been supporting farmers to increase their creativecommons.org/licenses/by/ productivity despite the increased costs of production and its environmental impact. Rapid 4.0/). Insects 2021, 12, 740. https://doi.org/10.3390/insects12080740 https://www.mdpi.com/journal/insects Insects 2021, 12, 740 2 of 12 intensification and industrialization of agriculture are often cited as contributing factors in insect declines [1–5]. Land-use changes in the 1950–1970s notably impacted modern intensive agricultural practices, resulting in a substitution of heterogeneous agricultural landscapes by homoge- neous ones. A big increase in farm size led to an elimination of edges and other ecologically valuable structural elements that had provided floral resources and nesting sites [4,6–10]. Habitat loss caused vital changes in the natural communities of birds, insects and mammals. In addition, the intensification measures have also led to soil quality losses [3,11–14]. Pollinating insects have been highlighted as being severely affected by agricultural intensification [15–22]. Within the pollinating insects, wild bees are often the group of insects that suffered the highest decline, reaching up to 50% of populations [19,23–25]. Over the last decades, several options were considered to reverse the situation. The use of multifunctional margins to increase the abundance of wildflowers, insects and birds has been highlighted as an important way of promoting nature conservation [3,5,26–30]. However, most of these studies are based on the study of bees or bumble bees [10,22,31–34], and only a few included all the insect groups [13,35]. In this work, assuming that biodiversity can be measured by the abundance of insects, the differences in several environments are evaluated and verified if their effect is perma- nent over time. This leads to testing two hypotheses. First, there is a benefit of integrating the cover plants in the inter-row lines of the crop to enhance biodiversity. Second, the use of cover plants improves biodiversity over time. These hypotheses were studied in five intensive wine farms in Spain. 2. Materials and Methods 2.1. Areas of Study For this study, five commercial farms were selected in Spain (Table1). All the estab- lished agricultural practices in these farms, such as tilling, fertilization, and phytosanitary treatments, remained unchanged. Management measures were confined to the crop, trying not to interfere with the cover plants. Table 1. Farm location and GPS information. Province Place GPS Coordinates Grape Variety Field Area (ha) 41◦37022.5100 N, Burgos Aranda de Duero Tempranillo 5 3◦41017.4400 W 40◦18000.6100 N, Madrid Villamanta Garnacha 4 4◦07017.8300 W 39◦49034.7000 N, Toledo El Carpio de Tajo Tempranillo 5 4◦26038.8000 W 39◦59036.0000 N, Toledo Otero Tempranillo 4 4◦31042.6000 W 41◦37001.0000 N, Valladolid Sardón de Duero Tempranillo 4.5 4◦24039.0000 W 2.2. Mixture Plant Selection The selection of plant species was based on several fundamental criteria such as the strict use of native species, ensuring a smooth climatic adaptation; being non-weed for the crop; featuring easy maintenance and capacity for self-sowing, as well as staggered flowering phenologies; and finally, being attractive for pollinators and natural enemies. The cover plants were established using an herbaceous mixture consisting of Borago officinalis L. (10%), Calendula officinalis L. (22.5%), Coriandrum sativus L. (10%), Diplotaxis catholica (L.) DC. (5%), Echium vulgare L. (5%), Melilotus officinalis (L.) Pall. (12.5%), Nigella damascena (L.) (5%), Salvia verbenaca L. (10%), Silene vulgaris (Moench) Garcke (10%), and Vicia sativa L. (10%). This mixture was sown by an electric drill with air distribution after the soil preparation by flail mower and subsequent covering of the seed with a drag. The Insects 2021, 12, 740 3 of 12 sowing dose used was 15 Kg/Ha. The cover plants were mowed in autumn and then left to regrow. 2.3. Experimental Design and Sampling To investigate the dynamics of effects of cover plants on insect biodiversity, the experiment was conducted for 3 years (2013–2015). From each farm, a field was selected, and this field was divided into two zones separated by 500–600 m. In zone 1 (with) three lines of cover plants were planted, while zone 2 (without) was kept without cover plants or weeds following the farming practices (application of residual herbicide at the beginning of the season and mechanical maintenance of weeds during the season to maintain the field without spontaneous vegetation). The insect abundance was assessed visually and by sweeping net (observed and captured specimens were merged to perform the corresponding analyses). The observations were done by moving in a zigzag along fixed transects of 50 × 2 m during 15 min per line and 4 times per day to avoid the light and temperature gradient and obtain a more representative sample. The samples were carried out four times per year based on the phenological state of the crop (leaf growth, flowering, veraison, and harvest). The collected specimens were preserved in cyanide to keep them intact and to avoid discoloration. All the specimens were identified to genus level using appropriate entomo- logical literature (see [36–50]). Specimens are deposited in the entomological collection of the National Museum of Natural Sciences (Madrid, Spain; MNCN). 2.4. Data Analysis An approach based on using statistical data analysis was developed to study the total number of insects as a measure of their biodiversity. To do that, we initially perform an exploratory data analysis of the counts of insects, comparing them among zones and between years to study their behaviour, identify abnormal situations, and detect patterns in the data.
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